linux-kernel - Re: [RFC PATCH 0/3] Perf persistent events

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Date:	Mon, 18 Mar 2013 17:38:01 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Borislav Petkov <bp@...e.de>, Robert Richter <rric@...nel.org>
Subject: Re: [RFC PATCH 0/3] Perf persistent events

Hi Borislav,

On Fri, 15 Mar 2013 14:06:26 +0100, Borislav Petkov wrote:
> From: Borislav Petkov <bp@...e.de>
>
> Yeah,
>
> here's a refresh of the persistent events deal, accessing those is much
> cleaner now. Here's how:
>
> So kernel code initializes and enables the event at its convenience
> (during boot, whenever) and userspace goes and says:
>
> 	sys_perf_event_open(pattr,...)
>
> with pattr.persistent = 1. Userspace gets the persistent buffer file
> descriptor to read from. Without that, we get a normal perf file
> descriptor for the duration of the tracing.
>
> This saves all the diddling of trying to hand down file descriptors
> through debugfs or whatever. Instead, current perf code simply can use
> it.

Interesting, it'll helpful profiling boot-time behaviors.

So my question is how can an user know which persistent events are
available in her system?

Thanks,
Namhyung

>
> This is still RFC but things are starting to fall into place slowly. As
> always, any and all comments/suggestions are welcome.
>
> Borislav Petkov (3):
>   perf: Add persistent events
>   perf: Add persistent event facilities
>   MCE: Enable persistent event
>
>  arch/x86/kernel/cpu/mcheck/mce.c |  25 +++++++
>  include/linux/perf_event.h       |  14 +++-
>  include/uapi/linux/perf_event.h  |   3 +-
>  kernel/events/Makefile           |   2 +-
>  kernel/events/core.c             |  27 +++++---
>  kernel/events/internal.h         |   4 ++
>  kernel/events/persistent.c       | 141 +++++++++++++++++++++++++++++++++++++++
>  7 files changed, 202 insertions(+), 14 deletions(-)
>  create mode 100644 kernel/events/persistent.c
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